Oil-fired space heater



FIG. 1 is a front view thereof;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is bottom plan view thereof.

The broken lines in FIG. 2 illustrate a recessed structure that is not part of the claimed design. 

The ornamental design for an oil-fired space heater, as shown and described. 